Crystallographic
Syngony	Cubic
Symmetry Class	m3m
Lattice Constants	a = 5.657 Å c = a
Cleavability	(111), perfect

Optical
Refractive Index at n10.6	4.0034
Refractive Index at n8.0 - n12.5	0.0036
Thermal Coefficient of Refractive Index at 3.39 microns for ±60 °C	35 - 40 x 10-5
Transmission Range, microns	2 - 17

Thermal
Thermal Linear Expansion, °C-1 for ±60 °C	(5.1 ... 5.8) x 10-6
Thermal Conductivity, W/(m * °C) at 27 °C	59.8
Specific Heat Capacity, J/(kg * °C)	0.310
Melting Point, °C	937
Absorbance m (l), cm -1
at 10.6 microns	0.027

Mechanical
Density, g/cm3 at 25 °C	5.33
Mohs Hardness	6
Vickers Microhardness, Pa	900 x 107
Constants of Elastic Compliance, Pa-1	S11 = 9.69 x 10-12 S12 = -2.65 x 10-12 S44 = 14.89 x 10-12
Young Modulus (E), Pa
in <100> direction	10.32x 1010
in <111> direction	15.56 x 1010
Shear Modulus (G), Pa
in <100> direction	6.72 x 1010
in <111> direction	4.67 x 1010
Poisson Ratio	0.278

Chemical
Molecular Weight	72.61
Solubility
in water, gram/100 cm3	insoluble

Ref. Index vs. Wavelength l
Wavelength, Microns	Refractive Index
2.0	4.1079
3.0	4.0446
4.0	4.0242
5.0	4.0153
6.0	4.0106
7.0	4.0076
8.0	4.0053
9.0	4.0047
10.0	4.0040
11.0	4.0031
12.0	4.0029
12.5	4.0024
15.0	4.0017

Internal Transmittance t i (l) vs. Wavelength l
Wavelength, Microns	Internal Transmittance
3.0	0.97
5.0	0.97
6.0	0.97
7.0	0.97
8.0	0.97
9.0	0.97
10.0	0.96
12.0	0.70
15.0	0.56

Custom sizes and specifications are available on request.